Itenso.TimePeriod.TimePeriodCollection.SortByStart C# (CSharp) Method

        public virtual void SortByStart( ListSortDirection sortDirection = ListSortDirection.Ascending )
        {
            switch ( sortDirection )
            {
                case ListSortDirection.Ascending:
                    periods.Sort( ( left, right ) => left.Start.CompareTo( right.Start ) );
                    break;
                case ListSortDirection.Descending:
                    periods.Sort( ( left, right ) => right.Start.CompareTo( left.Start ) );
                    break;
            }
        }

        public void SortByStartTest()
        {
            DateTime now = ClockProxy.Clock.Now;
            SchoolDay schoolDay = new SchoolDay( now );
            TimePeriodCollection timePeriods = new TimePeriodCollection();

            timePeriods.Add( schoolDay.Lesson4 );
            timePeriods.Add( schoolDay.Break3 );
            timePeriods.Add( schoolDay.Lesson3 );
            timePeriods.Add( schoolDay.Break2 );
            timePeriods.Add( schoolDay.Lesson2 );
            timePeriods.Add( schoolDay.Break1 );
            timePeriods.Add( schoolDay.Lesson1 );

            timePeriods.SortByStart();

            Assert.AreEqual( timePeriods[ 0 ], schoolDay.Lesson1 );
            Assert.AreEqual( timePeriods[ 1 ], schoolDay.Break1 );
            Assert.AreEqual( timePeriods[ 2 ], schoolDay.Lesson2 );
            Assert.AreEqual( timePeriods[ 3 ], schoolDay.Break2 );
            Assert.AreEqual( timePeriods[ 4 ], schoolDay.Lesson3 );
            Assert.AreEqual( timePeriods[ 5 ], schoolDay.Break3 );
            Assert.AreEqual( timePeriods[ 6 ], schoolDay.Lesson4 );
        }